// MIT License

// Copyright (c) 2019 Erin Catto

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#include "test.h"

extern B2_API bool g_blockSolve;

class BoxStack : public Test
{
public:
    enum
    {
        e_columnCount = 1,
        e_rowCount    = 15
        // e_columnCount = 1,
        // e_rowCount = 1
    };

    BoxStack()
    {
        {
            b2BodyDef bd;
            b2Body* ground = m_world->CreateBody(&bd);

            b2EdgeShape shape;
            shape.SetTwoSided(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
            ground->CreateFixture(&shape, 0.0f);

            shape.SetTwoSided(b2Vec2(20.0f, 0.0f), b2Vec2(20.0f, 20.0f));
            ground->CreateFixture(&shape, 0.0f);
        }

        float xs[5] = {0.0f, -10.0f, -5.0f, 5.0f, 10.0f};

        for (int32 j = 0; j < e_columnCount; ++j)
        {
            b2PolygonShape shape;
            shape.SetAsBox(0.5f, 0.5f);

            b2FixtureDef fd;
            fd.shape    = &shape;
            fd.density  = 1.0f;
            fd.friction = 0.3f;

            for (int i = 0; i < e_rowCount; ++i)
            {
                b2BodyDef bd;
                bd.type = b2_dynamicBody;

                int32 n = j * e_rowCount + i;
                b2Assert(n < e_rowCount * e_columnCount);
                m_indices[n]        = n;
                bd.userData.pointer = n;

                float x = 0.0f;
                // float x = RandomFloat(-0.02f, 0.02f);
                // float x = i % 2 == 0 ? -0.01f : 0.01f;
                bd.position.Set(xs[j] + x, 0.55f + 1.1f * i);
                b2Body* body = m_world->CreateBody(&bd);

                m_bodies[n] = body;

                body->CreateFixture(&fd);
            }
        }

        m_bullet = NULL;
    }

    void Keyboard(int key) override
    {
        switch (key)
        {
        case GLFW_KEY_COMMA:
            if (m_bullet != NULL)
            {
                m_world->DestroyBody(m_bullet);
                m_bullet = NULL;
            }

            {
                b2CircleShape shape;
                shape.m_radius = 0.25f;

                b2FixtureDef fd;
                fd.shape       = &shape;
                fd.density     = 20.0f;
                fd.restitution = 0.05f;

                b2BodyDef bd;
                bd.type   = b2_dynamicBody;
                bd.bullet = true;
                bd.position.Set(-31.0f, 5.0f);

                m_bullet = m_world->CreateBody(&bd);
                m_bullet->CreateFixture(&fd);

                m_bullet->SetLinearVelocity(b2Vec2(400.0f, 0.0f));
            }
            break;

        case GLFW_KEY_B:
            g_blockSolve = !g_blockSolve;
            break;
        }
    }

    void Step(Settings& settings) override
    {
        Test::Step(settings);
        DrawString(5, m_textLine, "Press: (,) to launch a bullet.");

        DrawString(5, m_textLine, "Blocksolve = %d", g_blockSolve);
        if (m_stepCount == 300)
        {
            if (m_bullet != NULL)
            {
                m_world->DestroyBody(m_bullet);
                m_bullet = NULL;
            }

            {
                b2CircleShape shape;
                shape.m_radius = 0.25f;

                b2FixtureDef fd;
                fd.shape       = &shape;
                fd.density     = 20.0f;
                fd.restitution = 0.05f;

                b2BodyDef bd;
                bd.type   = b2_dynamicBody;
                bd.bullet = true;
                bd.position.Set(-31.0f, 5.0f);

                m_bullet = m_world->CreateBody(&bd);
                m_bullet->CreateFixture(&fd);

                m_bullet->SetLinearVelocity(b2Vec2(400.0f, 0.0f));
            }
        }
    }

    static Test* Create() { return new BoxStack; }

    b2Body* m_bullet;
    b2Body* m_bodies[e_rowCount * e_columnCount];
    int32 m_indices[e_rowCount * e_columnCount];
};

static int testIndex = RegisterTest("Stacking", "Boxes", BoxStack::Create);
